CN109541026A - A kind of the non-linear ultrasonic detection system and detection method of reflective contact metal croop property - Google Patents
A kind of the non-linear ultrasonic detection system and detection method of reflective contact metal croop property Download PDFInfo
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- CN109541026A CN109541026A CN201811493843.4A CN201811493843A CN109541026A CN 109541026 A CN109541026 A CN 109541026A CN 201811493843 A CN201811493843 A CN 201811493843A CN 109541026 A CN109541026 A CN 109541026A
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- G—PHYSICS
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- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N29/00—Investigating or analysing materials by the use of ultrasonic, sonic or infrasonic waves; Visualisation of the interior of objects by transmitting ultrasonic or sonic waves through the object
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Abstract
The present invention relates to a kind of non-linear ultrasonic detection system of reflective contact metal croop property and detection methods, the non-linear ultrasonic detection system of the metal creep performance, emitted and received ultrasound detection signal by a ultrasonic transducer, and by being separated received detection signal to extract higher hamonic wave signal and fundamental signal respectively, and then obtain the non-linear ultrasonic parameter for assessing metal creep performance；Detection system of the present invention is due to only with a ultrasonic transducer, thus avoid in practical applications and carry out detection using two ultrasonic transducers and bring and be difficult to ensure the problem of two ultrasonic transducers are in coaxial position, based on the non-linear ultrasonic detection method of the detection system in metal creep field application accuracy with higher and good applicability.
Description
Technical field
The invention belongs to technical field of nondestructive testing more particularly to a kind of non-linear ultrasonic detection systems of metal creep performance
System and method.
Background technique
Creep refers to the process of that material is slowly plastically deformed, this phenomenon long lasting effect the entire service phase of metal component
Between, and when metal component is on active service by the effect lower than its yield stress under high temperature environment, creep is brought to metal component
Damage can not just have ignored.In today of industrial boom, in numerous necks such as energy source and power, petrochemical industry, aerospace
In domain, many metal components long service under high temperature, condition of high voltage will generate inevitable creep impairment phenomenon, this
Creep restricts the operation of equipment, also threatens the safety of equipment, this makes that creep cannot be ignored in process of production
It influences, assessment equipment creep state simultaneously predicts material remaining life just and seems of crucial importance.
Non-linear ultrasonic detection is being worn according to the nonlinear effect i.e. sine wave (fundamental wave) of a column finite amplitude of material
When crossing material, sound wave can occur " to distort " in communication process and " distortion " is to generate high-frequency harmonic (higher hamonic wave), and produces
Raw higher hamonic wave is very sensitive for the creep variation of material.Ultrasound non-linear parameter is as a kind of characterization metal material creep
The parameter of state, which generallys use through transmission technique acquisition, referring specifically to " the non-linear ultrasonic of steam turbine rotor steel creep impairment
Evaluation " (Zhang Meng, Xuan Fuzhen, " mechanical engineering journal ", the 2nd phase of volume 52, in January, 2016), the through transmission technique are using one
Low frequencies probe transmitting detection signal simultaneously receives detection signal by a high-frequency reception energy converter, and this method needs to keep hair
It penetrates and receives ultrasonic transducer and be in coaxial position, and the upper and lower surfaces for emitting, receiving detection position locating for energy converter are necessary
It is smooth, smooth, it is difficult to ensure that transmitting and reception ultrasonic transducer are in coaxial position when detecting to large-scale workpiece, simultaneously
At the scene detect when by work condition environment is influenced be tested component inner surface be difficult to sometimes close to (such as the inner wall of chemical industry equipment by
It is not easy to carry out removing surface polishing work in narrow space or corrosive environment etc.), thus the application of through transmission technique is limited to.
If the data acquisition of ultrasound non-linear parameter can only be completed by a ultrasonic transducer, then will be non-linear ultrasonic
Evaluation metal creep performance brings very big convenience, and makes creep detection real from the laboratory of test block or sample detection trend
On-site test be achieved.
Summary of the invention
It is an object of the present invention to provide a kind of detection system and detection method popped one's head in only with one, quick with progress,
Accurate detection.
Purpose to realize the present invention, is achieved using following technical scheme.
A kind of non-linear ultrasonic detection system of metal creep performance, comprising:
Signal transmitting acquisition and display memory module, signal emission module and signal receiving module.
The described signal transmitting acquisition and display memory module include: high-frequency impulse R-T unit, computer, oscillograph,
Wherein computer is for adjusting the high-frequency impulse R-T unit, and oscillograph is for feeding back and showing high-frequency impulse R-T unit institute
The data information of storage.
The signal emission module, comprising: high-frequency impulse R-T unit, impedance-matching device, attenuator, low-pass filtering
Device, collector, duplexer and ultrasonic transducer；Wherein, the impulse ejection end of the high-frequency impulse R-T unit, impedance matching dress
Set, attenuator, low-pass filter are sequentially connected with, the output end of the low-pass filter is connected to the first interface of collector, institute
The second interface for stating collector is connected to the first port of duplexer (8), and the second port of the duplexer is connected to ultrasound and changes
It can device；
The signal receiving module, comprising: the first signal reception group and second signal reception group；
The first signal reception group, comprising:；Wherein, ultrasonic transducer, duplexer, high-pass filter, preposition amplification
Device, high-frequency impulse R-T unit；Wherein, the output end of ultrasonic transducer is connected to the second port of duplexer, and the of duplexer
Three ports are connected to the signal input part of high-pass filter, and the output end of high-pass filter is received through preamplifier to high-frequency impulse
First acquisition channel of transmitting apparatus；
The second signal reception group, comprising: ultrasonic transducer, duplexer, collector, high-frequency impulse R-T unit；Its
In, the output end of ultrasonic transducer is connected to the second port of duplexer, and the first port of duplexer is connected to the of collector
Two interfaces, the third interface of collector are connected with the second acquisition channel of high-frequency impulse R-T unit.
Further, the corresponding centre frequency of the high-pass filter be twice of the centre frequency of the low-pass filter and
More than.
Further, the ultrasonic transducer is transceiver and -6dB band is wider than 50%.
Further, the system also includes information judging devices, are connected with the high-frequency impulse R-T unit, for pair
The detection information of first acquisition channel and the second acquisition channel that receive carries out interpretation and verifies the detection information
Correctness, connection and the work setting to ensure all parts in the system are correct；
The information judging device includes:
Signal time-frequency output module, by built-in mathematical tool read the high-frequency impulse R-T unit first,
The detection information of second acquisition channel, for generating the time-domain signal figure of corresponding detection signals；
Signal time reading module, for judging the working condition of the system by time-parameters, i.e., it is built in
Mathematical tool obtain the signal Bao Luo of above-mentioned time-domain signal, and obtain the corresponding inspection of first, second acquisition channel accordingly
Survey signal leading edge time and receiving time, thus according to known ultrasonic propagation velocity c obtain calculated thickness, and with it is described to
The actual (real) thickness for surveying workpiece compares, and then shows when the corresponding calculated thickness of the first, second acquisition channel is equal to actual (real) thickness
The system all parts connection is errorless；
Signal amplitude-frequency output module is used to read the of the high-frequency impulse R-T unit by built-in mathematical tool
One, the detection information of the second acquisition channel and the amplitude versus frequency signal graphs of corresponding detection signals is generated；
Signal frequency reading module, for judging the working condition of the system by frequency parameter, i.e., it is built in
Mathematical tool calculate the centre frequency for obtaining above-mentioned amplitude versus frequency signal, by comparing two centre frequencies and fundamental signal
Whether the relationship of centre frequency, the work setting to judge the system are correct；When centre frequency=base of the second acquisition channel
When the centre frequency of wave signal=first acquisition channel centre frequency/2, then showing the system all parts work setting just
It is really errorless.
Based on the non-linear ultrasonic detection system of the reflective contact metal croop property, the present invention proposes following metal creep
The non-linear ultrasonic detection method of performance, method includes the following steps:
1) the non-linear ultrasonic detection system of the reflective contact metal croop property is established；
2) the detected region of workpiece for measurement is polished flat, and keeps clean；
3) daubing coupling agent and the tested of the workpiece for measurement is fixed in the detection faces of the ultrasonic transducer
Survey region；
4) adjustment computer is set simultaneously with controlling the high-frequency impulse R-T unit transmitting single-frequency fundamental detecting pulse signal
It sets the oscillograph relevant parameter and is shown that wherein the memory length of oscillograph is set as maximum storage；
5) detection information and the second acquisition channel of first acquisition channel of high-frequency impulse R-T unit are stored respectively
Detection information；
6) by information judging device automatically the detection information to the first acquisition channel and the second acquisition channel detection letter
The correctness of breath is verified:
(6-1) is firstly, read detection information and the drafting of above-mentioned first, second acquisition channel by signal time-frequency output module
Detect the time-domain signal figure of signal；
(6-2) then, signal time reading module is respectively according in the corresponding time-domain signal figure of the first, second acquisition channel
The time of occurrence of signal is detected, calculates sound path S according to the following equation,
S=v (t1-t2)
Wherein, v represents the spread speed of ultrasound in the workpiece, t1Represent the receiving time of ultrasound detection signal, t2Generation
The leading edge time of table ultrasound detection signal；
S is compared with 2h, h represents the thickness of workpiece for measurement；As S=2h, show the ultrasound detection that measurement obtains
Signal matches with theory detection signal, finds corresponding data storage point according to the time of occurrence domain of ultrasound detection signal at this time
Range；As S ≠ 2h, check whether the connection of the system and ultrasonic propagation velocity parameter setting are correct；
After (6-3) determines the range of dot data memory according to step (6-2), signal amplitude-frequency output module reads the range
Interior data simultaneously carry out frequency spectrum conversion to data to draw width corresponding to the detection information of above-mentioned first, second acquisition channel
Degree-frequency diagram；
(6-4) signal frequency reading module carries out the interpretation of centre frequency, the i.e. detection information pair when the first acquisition channel
Answer amplitude versus frequency figure centre frequency be the second acquisition channel detection information respective amplitude-frequency diagram centre frequency two
Times, and detection information respective amplitude-frequency diagram centre frequency of the second acquisition channel and above-mentioned high-frequency impulse R-T unit (1)
When the centre frequency of transmitting single-frequency fundamental detecting pulse signal is identical, the inspection of detection information correctness is completed, the system
Work setting is correct；Otherwise the system is adjusted, until the inspection of above-mentioned detection information is correct；
7) after completing above-mentioned inspection, computer (2) controls high-frequency impulse R-T unit (1) and emits fundamental detecting pulse signal
The region to be measured of workpiece for measurement is detected；
8) collected data information is handled by mathematical tool, calculates ultrasonic second harmonic non-linear parameter β:
Wherein, c is ultrasonic propagation velocity, and ω is ultrasonic angular frequency, and c and ω are obtained before detection, a1For fundamental frequency amplitude, a2
For secondary harmonic amplitude, collected data information is handled by mathematical tool and obtains a1And a2, so that detection zone be calculated
Ultrasonic second harmonic non-linear parameter β corresponding to domain characterizes the corresponding material of the workpiece for measurement by the size variation of β and passes through
The variation for going through croop property after different creep times, to complete the detection of croop property.
Further, the mathematical tool is MATLAB.
The beneficial effects of the present invention are: the non-linear ultrasonic detection system of the metal creep performance, using ultrasonic transduction
Device is emitted and is received ultrasound detection signal, by being separated extraction higher hamonic wave signal respectively to received detection signal
The non-linear ultrasonic parameter for assessing metal creep performance is obtained in turn with fundamental signal.Since the non-linear ultrasonic detects
System is only with a ultrasonic transducer, to can not have to consider the problems of above-mentioned " coaxial position " in practical applications
, bring great convenience to the field application of non-linear ultrasonic assessment metal creep technology.It is filled by setting information interpretation
It sets, automatic interpretation, detection system when realizing on-site test is carried out in terms of time and frequency two to the detection information received
The fast automatic verifying of system, is greatly saved the detection system field adjustable time, it is ensured that creep detect quickly and efficiently, result it is quasi-
Really.
Detailed description of the invention
Fig. 1 is the non-linear ultrasonic detection system structure chart of metal creep performance of the present invention；
Fig. 2 is partial structural diagram of the invention；
Fig. 3 is the specific embodiment of the invention the first acquisition channel time-domain diagram；
Fig. 4 is the specific embodiment of the invention the second acquisition channel time-domain diagram；
Fig. 5 is the specific embodiment of the invention the first acquisition channel amplitude versus frequency figure；
Fig. 6 is the specific embodiment of the invention the second acquisition channel amplitude versus frequency figure；
1, high-frequency impulse R-T unit；2, computer；3, impedance-matching device；4, attenuator；5, low-pass filter；6, it adopts
Storage；61, first interface；62, second interface；63, third interface；7, ultrasonic transducer；8, duplexer；81, first port；
82, second port；83, third port；9, high-pass filter；10, preamplifier；11, oscillograph.
Specific embodiment
Below according to attached drawing 1 to 6, the present invention will be described in detail:
Specific embodiment one:
The non-linear ultrasonic detection system of metal creep performance, comprising: signal transmitting acquisition and display memory module, signal
Transmitting module and signal receiving module；
The signal transmitting acquisition and display memory module includes: high-frequency impulse R-T unit 1, computer 2, oscillograph
11；Wherein, computer 2 is for adjusting the high-frequency impulse R-T unit 1, and oscillograph 11 is for feeding back and showing that high-frequency impulse is received
The data information that transmitting apparatus 1 is stored；
The signal emission module, comprising: high-frequency impulse R-T unit 1, impedance-matching device 3, attenuator 4, low pass
Filter 5, collector 6, duplexer 8 and ultrasonic transducer 7；Wherein, the impulse ejection end of the high-frequency impulse R-T unit 1,
Impedance-matching device 3, attenuator 4, low-pass filter 5 are sequentially connected with, and the output end of the low-pass filter 5 is connected to collector
6 first interface 61, the second interface 62 of the collector 6 are connected to the first port 81 of duplexer 8, the duplexer 8
Second port 82 is connected to ultrasonic transducer 7；
The signal receiving module, comprising: the first signal reception group and second signal reception group；
The first signal reception group, comprising:；Wherein, ultrasonic transducer 7, duplexer 8, high-pass filter 9, preceding storing
Big device 10, high-frequency impulse R-T unit 1；Wherein, the output end of ultrasonic transducer 7 is connected to the second port 82 of duplexer 8, double
The third port 83 of work device 8 is connected to the signal input part of high-pass filter 9, and the output end of high-pass filter 9 is put greatly before menstruation
Device 10 to high-frequency impulse R-T unit 1 the first acquisition channel；
The second signal reception group, comprising: ultrasonic transducer 7, duplexer 8, collector 6, high-frequency impulse R-T unit
1；Wherein, the output end of ultrasonic transducer 7 is connected to the second port 82 of duplexer 8, and the first port 81 of duplexer 8 connects
To the second interface 62 of collector 6, the second acquisition channel phase of the third interface 63 and high-frequency impulse R-T unit 1 of collector 6
Even.
Further, low-pass filter 5 includes matching with the pulse signal frequency of the transmitting of high-frequency impulse R-T unit 1
One or two low-pass filter.
Further, the corresponding centre frequency of high-pass filter 9 is twice in the centre frequency of low-pass filter 5.
Further, ultrasonic transducer 7 is collection transceiver and -6dB band is wider than 50%.
Further, the centre frequency of low frequency filtering combination is 5MHz, and the centre frequency of high-pass filter is 10MHz, is surpassed
The centre frequency of sonic transducer is 5MHz；
Since fundamental wave energy is generally more three orders of magnitude greater than second harmonic energy, 6 use of collector-in this system
The gain of the collector of 40dB decaying, preamplifier 10 is 10dB, and such fundamental signal just can exist with second harmonic signal
Display on the same screen on oscillograph 11.
The course of work of the non-linear ultrasonic detection system of reflective contact metal croop property of the present invention is as follows:
Firstly, controlling high-frequency impulse emitter 1 by computer 2 emits pure-tone pulse sinusoidal signal, that is, fundamental signal；
The fundamental signal enters low-pass filter 5 after impedance matching 3 and attenuator 4 carry out energy adjusting and is produced with removing the system
Raw higher hamonic wave；Then, the fundamental signal successively pass through the first interface 61 of collector 6, second interface 62 be transmitted to it is double
The first port 81 of work device 8 is to the ultrasonic transducer 7；
The bottom wave reflection of one-time detection wave after being entered workpiece for measurement due to the fundamental signal is taken when returning ultrasonic transducer
Include fundamental frequency signal information and high-frequency signal information with a large amount of useful informations, therefore one-time detection wave base wave reflection signal is led to
It crosses duplexer 8 and is separated into two-way:
Signal is reflected for the lower fundamental frequency of energy all the way, is by the way that the output end of the ultrasonic transducer 7 to be connected to
The duplexer 8 is successively transmitted to the high-pass filter 9 via the second port 82 of the duplexer 8, third port 83,
The road signal is after the high-pass filter 9 removes clutter, then enters the height after the 10 gain 10dB of preamplifier
First acquisition channel of frequency impulse starter 1 is simultaneously shown by oscillograph 11.
Another way is that the higher fundamental frequency of energy reflects signal, is by connecting the output end of the ultrasonic transducer 7
To the duplexer 8, the collector 6 successively is transmitted to via the second port 82 of the duplexer 8, first port 81
Second interface 62, third interface 63 are transmitted to described again after collector 6 is to the energy attenuation of the road signal progress -40dB
Second acquisition channel of high-frequency impulse emitter 1 is simultaneously shown by oscillograph 11；
To the signal message of the first acquisition channel and the second acquisition channel Display on the same screen in oscillograph 11.
Due to big 3 orders of magnitude of fundamental frequency signal energy ratio second harmonic signal energy, by utilizing collector 6 to fundamental frequency
Signal is carried out decaying and may make fundamental frequency signal and high-frequency signal after being amplified using preamplifier 10 to the gain of high-frequency signal
Can on oscillograph 11 Display on the same screen, and then data in oscillograph 11 are stored, and then for example, by the number such as MATLAB
Tool is further processed the ultrasonic second harmonic non-linear parameter that can be obtained for detecting metal material creep impairment.
The effective creep parallel-segment size of workpiece is equal are as follows: 250mm (length) × 52mm (thickness) × 35mm (width), meanwhile, based on upper
The detection method for stating the non-linear ultrasonic detection system of reflective contact metal croop property, includes the following steps,
1) the non-linear ultrasonic detection system of reflective contact metal croop property as described above is constructed, and in the manner described above
The modules of the detection system are attached；
2) the detected region of workpiece for measurement is polished flat, and keeps clean；
3) daubing coupling agent and the tested of the workpiece for measurement is fixed in the detection faces of the ultrasonic transducer 7
Survey region；
4) adjustment computer 2 emits single-frequency fundamental detecting pulse signal to control high-frequency impulse R-T unit 1, is arranged simultaneously
11 relevant parameter of oscillograph is shown that wherein the memory length of oscillograph 11 is set as maximum storage, for example, setting single-frequency base
The frequency that wave detects pulse signal is 5MHz, and the memory length of oscillograph 11 is 16000；
5) signal is received, the detection information and second for storing the first acquisition channel of high-frequency impulse R-T unit 1 respectively is adopted
Collect the detection information in channel；
6) by information judging device automatically the detection information to the first acquisition channel and the second acquisition channel detection letter
The correctness of breath is verified:
(6-1) is firstly, read the detection information and the second acquisition of above-mentioned first acquisition channel by signal time-frequency output module
The detection information in channel and the time-domain signal figure for drawing detection signal, are illustrated in figure 3 the first acquisition channel data time-domain diagram, scheme
4 be the second acquisition channel data time-domain diagram, can see ultrasonic transducer 7 from the time-domain diagram of acquisition signal and receives in 20 μ s-25 μ s
It is fed back to first time signal, subsequent signal time reading module is respectively according to the corresponding time-domain signal of the first, second acquisition channel
The time of occurrence that signal is detected in figure, calculates sound path S according to the following equation,
S=v (t1-t2)
Wherein, v represents the spread speed of ultrasound in the workpiece, t1Represent the receiving time of ultrasound detection signal, t2Generation
The leading edge time of table ultrasound detection signal；Since ultrasonic velocity is influenced by level of creep, v takes 5900m/s here；By taking Fig. 3 as an example,
t12.057 × 10 are shown as on time-domain diagram-5S, t20.2712 × 10 is shown as on time-domain diagram-5s；
S is compared by (6-2) with 2h, and h represents the thickness of workpiece for measurement, is here 52mm；By taking Fig. 3 as an example, it is computed
Have
v(t1-t2)=5900000mm/s × (2.057-0.2712) × 10-52 × 52=104mm of s=105.3622mm ≈
=2h
Under the premise of in view of the taken ultrasonic existing error between the velocity of sound and real velocity of sound propagated in workpiece, lead to
Crossing above-mentioned calculating relatively can determine that the signal occurred between 20 μ s-25 μ s of time-domain diagram feedback is exactly sent out by ultrasonic transducer
The bottom wave reflection signal of the one-time detection wave of 7 detection signal is penetrated, this shows the ultrasound detection that the measurement of the first acquisition channel obtains
Signal matches with theory detection signal.Similarly, the ultrasound detection signal and theory for verifying the second acquisition channel, which detect signal, is
It is no to coincide.
When coincideing, the range of corresponding data storage point is found according to detection epoch domain.If misfitting, check
Whether the connection of the system and ultrasonic propagation velocity parameter setting are correct；
After (6-3) determines the range of dot data memory according to above-mentioned steps, signal amplitude-frequency output module is read within the scope of this
Data and frequency spectrum conversion carried out to data draw amplitude-frequency corresponding to the detection information of above-mentioned first, second acquisition channel
Rate figure.Such as the corresponding amplitude versus frequency figure of detection information that Fig. 5 is the first acquisition channel, Fig. 6 is that the detection of the second acquisition channel is believed
Cease corresponding amplitude versus frequency figure；
(6-4) signal frequency reading module carries out the interpretation of centre frequency, the i.e. detection information pair when the first acquisition channel
Answer amplitude versus frequency figure centre frequency be the second acquisition channel detection information respective amplitude-frequency diagram centre frequency two
Times, and detection information respective amplitude-frequency diagram centre frequency of the second acquisition channel corresponds to above-mentioned high-frequency impulse R-T unit 1
When emitting the centre frequency of single-frequency fundamental detecting pulse signal, the inspection of detection signal correctness is completed.As can be seen from Figure 5
The centre frequency of the detection information of one acquisition channel is 10MHz, as can be seen from Figure 6 in the detection information of the second acquisition channel
Frequency of heart is 5MHz；
7) after completing above-mentioned inspection, computer (2) controls high-frequency impulse R-T unit (1) and emits fundamental detecting pulse signal
The region to be measured of workpiece for measurement is detected；
8) collected data information is handled by mathematical tool, calculates ultrasonic second harmonic non-linear parameter β:
Wherein, c is ultrasonic propagation velocity, and ω is ultrasonic angular frequency, and c and ω are obtained before detection, a1For fundamental frequency width
Value, a2For secondary harmonic amplitude, collected data information is handled by mathematical tool and obtains a1And a2, so that inspection be calculated
Ultrasonic second harmonic non-linear parameter β corresponding to region is surveyed, the corresponding material of the workpiece for measurement is characterized by the size variation of β
Matter undergoes the variation of croop property after different creep times, to complete the detection evaluation of croop property.
Further, the mathematical tool is MATLAB.
What has been described above is only an embodiment of the present invention, and the common sense such as well known specific structure or characteristic are not made herein in scheme
Excessive description.It, without departing from the structure of the invention, can be with it should be pointed out that for those skilled in the art
Several modifications and improvements are carried out, these also should be considered as protection scope of the present invention, these all will not influence what the present invention was implemented
Effect and patent practicability.The present invention claims protection scope should be based on the contents of the claims, the tool in specification
The records such as body embodiment can be used for explaining the content of claim.
Claims (5)
1. a kind of non-linear ultrasonic detection system of reflective contact metal croop property, which is characterized in that
The system comprises: signal transmitting acquisition and display memory module, signal emission module and signal receiving module；
The signal transmitting acquisition and display memory module, comprising: high-frequency impulse R-T unit (1), computer (2) and oscillography
Device (11)；Wherein, computer (2) is for adjusting the high-frequency impulse R-T unit (1), and oscillograph (11) is for feeding back and showing
The data information that high-frequency impulse R-T unit (1) is stored；
The signal emission module, comprising: high-frequency impulse R-T unit (1), impedance-matching device (3), attenuator (4), low
Bandpass filter (5), collector (6), duplexer (8) and ultrasonic transducer (7)；Wherein, the high-frequency impulse R-T unit (1)
Impulse ejection end, impedance-matching device (3), attenuator (4), low-pass filter (5) are sequentially connected with, the low-pass filter (5)
Output end be connected to the first interfaces (61) of collector (6), the second interface (62) of the collector (6) is connected to duplexer
(8) second port (82) of first port (81), the duplexer (8) is connected to ultrasonic transducer (7)；
The signal receiving module, comprising: the first signal reception group and second signal reception group；
The first signal reception group, comprising: ultrasonic transducer (7), duplexer (8), high-pass filter (9), preamplifier
(10) and high-frequency impulse R-T unit (1)；Wherein, the output end of ultrasonic transducer (7) is connected to the second port of duplexer (8)
(82), the third port (83) of duplexer (8) is connected to the signal input part of high-pass filter (9), high-pass filter (9) it is defeated
Outlet is connected to the first acquisition channel of high-frequency impulse R-T unit (1) through preamplifier (10)；
The second signal reception group, comprising: ultrasonic transducer (7), duplexer (8), collector (6) and high-frequency impulse transmitting-receiving dress
Set (1)；Wherein, the output end of ultrasonic transducer (7) is connected to the second port (82) of duplexer (8), and the first of duplexer (8)
Port (81) is connected to the second interface (62) of collector (6), and third interface (63) and the high-frequency impulse transmitting-receiving of collector (6) fill
The second acquisition channel for setting (1) is connected；
The course of work of the non-linear ultrasonic detection system of the reflective contact metal croop property is as follows:
Firstly, emitting pulsed sinusoidal signal, i.e. fundamental signal by computer (2) control high-frequency impulse emitter (1)；It is described
Fundamental signal enters low-pass filter (5) after impedance matching (3) and attenuator (4) carry out energy adjusting to remove the system
The higher hamonic wave of generation；Then, the fundamental signal successively passes through the first interface (61) of collector (6), second interface (62)
The first port (81) for being transmitted to duplexer (8) enters the ultrasonic transducer (7) later；
The bottom wave reflection of one-time detection wave after being entered workpiece for measurement due to the fundamental signal is carried when returning ultrasonic transducer
A large amount of useful informations include fundamental frequency signal information and high-frequency signal information, therefore one-time detection wave base wave reflection signal are passed through double
Work device (8) is separated into two-way:
Signal is reflected for the lower fundamental frequency of energy all the way, is by the way that the output end of the ultrasonic transducer (7) is connected to institute
Duplexer (8) are stated, successively the high pass is transmitted to via the second port (82) of the duplexer (8), third interface (83) and filters
Wave device (9), the road signal are then laggard through the preamplifier (10) gain after the high-pass filter (9) remove clutter
Enter the first acquisition channel of the high-frequency impulse emitter (1) and is shown by oscillograph (11)；
Another way is that the higher fundamental frequency of energy reflects signal, is by the way that the output end of the ultrasonic transducer (7) to be connected to
The duplexer (8) is successively transmitted to the acquisition via the second port (82) of the duplexer (8), first port (81)
The second interface (62) of device (6), third interface (63) are transmitted again after collector (6) carries out energy attenuation to the road signal
To the high-frequency impulse emitter (1) the second acquisition channel and by oscillograph (11) show；
To the signal message of first acquisition channel and the second acquisition channel Display on the same screen in oscillograph (11).
2. a kind of non-linear ultrasonic detection system of reflective contact metal croop property according to claim 1, feature exist
In: the corresponding centre frequency of the high-pass filter (9) is twice of low-pass filter (5) centre frequency.
3. a kind of non-linear ultrasonic detection system of reflective contact metal croop property according to claim 1, feature exist
In: the ultrasonic transducer (7) is transceiver and -6dB band is wider than 50%.
4. a kind of non-linear ultrasonic detection system of reflective contact metal croop property according to claim 1, feature exist
In: the system also includes information judging devices, be connected with the high-frequency impulse R-T unit (1), for receiving
The detection information of first acquisition channel and the second acquisition channel carries out interpretation and verifies the correctness of the detection information, with
Ensure that connection and the work setting of all parts in the system are correct；
The information judging device includes:
Signal time-frequency output module reads first, the of the high-frequency impulse R-T unit (1) by built-in mathematical tool
The detection information of two acquisition channels, for generating the time-domain signal figure of corresponding detection signals；
Signal time reading module, for judging the working condition of the system by time-parameters, i.e., it passes through built-in number
Tool obtains the signal Bao Luo of above-mentioned time-domain signal, and obtains the corresponding detection letter of first, second acquisition channel accordingly
Number leading edge time and receiving time, thus according to known ultrasonic propagation velocity c obtain calculated thickness, and with the work to be measured
The actual (real) thickness of part compares, and then shows when the corresponding calculated thickness of the first, second acquisition channel is equal to actual (real) thickness described
The connection of system all parts is errorless；
Signal amplitude-frequency output module is used to read the of the high-frequency impulse R-T unit (1) by built-in mathematical tool
One, the detection information of the second acquisition channel and the amplitude versus frequency signal graphs of corresponding detection signals is generated；
Signal frequency reading module, for judging the working condition of the system by frequency parameter, i.e., it passes through built-in number
Tool calculates the centre frequency for obtaining above-mentioned amplitude versus frequency signal, by comparing two centre frequencies and fundamental signal center
Whether the relationship of frequency, the work setting to judge the system are correct；When centre frequency=fundamental wave letter of the second acquisition channel
Number centre frequency=first acquisition channel centre frequency/2 when, then show that correct nothing is arranged in system all parts work
Accidentally.
5. the detection side based on the non-linear ultrasonic detection system of a kind of reflective contact metal croop property described in the claims 4
Method, which comprises the following steps:
1) the non-linear ultrasonic detection system of reflective contact metal croop property a method as claimed in any one of claims 1 to 5 is constructed, and is pressed
The modules of the detection system are attached according to mode described in claim 1；
2) the detected region of workpiece for measurement is polished flat, and keeps clean；
3) appropriate couplant is smeared on ultrasonic transducer (7) surface and be fixed in the detected region of the workpiece for measurement；
4) adjustment computer (2) is to control high-frequency impulse R-T unit (1) transmitting fundamental detecting pulse signal, while oscillography is arranged
Device (11) relevant parameter is shown that wherein the memory length of oscillograph (11) is set as maximum storage；
5) oscillograph (11) receives signal, stores the first acquisition channel and second acquisition of high-frequency impulse R-T unit (1) respectively
The detection information in channel；
6) pass through information judging the device detection information to the first acquisition channel and the detection information of the second acquisition channel automatically
Correctness is verified:
(6-1) is firstly, reading the detection information of above-mentioned first, second acquisition channel by signal time-frequency output module and drawing detection
The time-domain signal figure of signal；
(6-2) then, signal time reading module is detected according in the corresponding time-domain signal figure of the first, second acquisition channel respectively
The time of occurrence of signal calculates sound path S according to the following equation,
S=v (t1-t2)
Wherein, v represents the spread speed of ultrasound in the workpiece, t1Represent the receiving time of ultrasound detection signal, t2It represents super
The leading edge time of sound detection signal；
S is compared with 2h, h represents the thickness of workpiece for measurement；As S=2h, show the ultrasound detection signal that measurement obtains
It matches with theory detection signal, finds the model of corresponding data storage point according to the time of occurrence domain of ultrasound detection signal at this time
It encloses；As S ≠ 2h, check whether the connection of the system and ultrasonic propagation velocity parameter setting are correct；
After (6-3) determines the range of dot data memory according to step (6-2), signal amplitude-frequency output module is read within the scope of this
Data simultaneously carry out frequency spectrum conversion to data to draw the detection information of above-mentioned first acquisition channel and the detection of the second acquisition channel
Amplitude versus frequency figure corresponding to information；
(6-4) signal frequency reading module carries out the interpretation of centre frequency, i.e., when the detection information of the first acquisition channel corresponds to width
Degree-frequency diagram centre frequency is two times of detection information respective amplitude-frequency diagram centre frequency of the second acquisition channel, and
Detection information respective amplitude-frequency diagram centre frequency of second acquisition channel and above-mentioned high-frequency impulse R-T unit (1) emit
When the centre frequency of single-frequency fundamental detecting pulse signal is identical, the inspection of detection information correctness, the work of the system are completed
Setting is correct；Otherwise the system is adjusted, until the inspection of above-mentioned detection information is correct；
7) after completing above-mentioned inspection, computer (2) control high-frequency impulse R-T unit (1) transmitting fundamental detecting pulse signal is treated
It is detected in the region to be measured for surveying workpiece；
8) collected data information is handled by mathematical tool, calculates ultrasonic second harmonic non-linear parameter β:
Wherein, c is ultrasonic propagation velocity, and ω is ultrasonic angular frequency, and c and ω are obtained before detection, a1For fundamental frequency amplitude, a2It is two
Subharmonic amplitude handles collected data information by mathematical tool and obtains a1And a2, so that it is right that detection zone institute is calculated
The ultrasonic second harmonic non-linear parameter β answered characterizes the corresponding material of the workpiece for measurement by the size variation of β and undergoes difference
The variation of croop property after creep time, to complete the detection of croop property.
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